Transformer construction



May 2, 1933. A. HELGASON 1,906,586

TRA RRRRRRRRRRRRRRRRRR ON Patented May 2, 1933 UNITED STATES PATENTOFFICE ARNI IIELGASON, OIF CHICAGO, ILLINOIS, ASSIGNOR T0 CHICAGOTRANSFORMER COR- PORATION, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS TRANSFORMER CONSTRUCTION Application filed November 16, 1932.

The present invention relates to transformer construction and moreparticularly to the construction of end frames and cover plates toprovide additional space for making internal connections to thetransformer ternunals whereby additional terminals may be mounted on thecover plates.

An object of the present invention is to improve transformerconstruction in such manner as to afford means for application of aplurality of terminal connections to the cover plates.

Another object of the invention is to pro vide end frames fortransformers so constructed as to afford increased space at thetransformer ends for making internal connections to terminals.

A still further object of the invention is to provide end frames fortransformers hav ing cover plate attaching flanges spaced from the coilends to provide additional space for terminal connections.

The above, other and further objects of the invention will be apparentfrom the following description, accompanying drawing and appendedclaims.

The accompanying drawing illustrates emN bodiments of the presentinvention, and the views thereof as follows:

Fig. l is a side elevational view of a transformer constructed inaccordance with the principles `of the present invention.

Fig. 2 is a fragmental view, partially in elevation and partially invertical section, showing details of construction.

Fig. 3 is an end view of the transformer illustrated in Figure 1.

The drawing will now be explained.

The drawing illustrates a transformer having a core designated generallyat A and a coil B. The core is illustrated as comprising a plurality oflaminations of suitable electrical characteristics, arrangement anddesign. The coil B is designated conventionally.

The end frames of the present invention are preferably formed ascastings and each is rectangular in elevation and angular incross-section. This construction provides a vertical flange portion ldefining a central Serial No. 642,831.

opening` 2 of sufficient size to receive within it the ends of the coilB and to be spaced from the coil a sufficient dist-ance. The horizontalportions 3 of the end plates are at right angular relationship with theflanges l, and when arranged in assembled position extend away from theadjacent end of the core A and are spaced outwardly of the core body.The form of core illustrated is rectangular,

will be rectangular.

The end frames are provided with feet Ll for supporting the transformeron a suitable base. The end frames are assembled as illustrated inFigure l with the horizontal flange portion of each plate 5 is offset asindicated at 4' to provide space between the adjacent end of the coil Band the offset portion 7 'for making internal connections between theends of the coil and the cover plates.

The various terminals 6, of which eight are shown in the accompanyingdrawing, are supported on the cover plates in the following manner. Thecover plates 5 are provided with a plurality of apertures for receivinginsulating bushings 9 and all. of which have enlargements or flanges l()near the rear end thereof, which flanges bear against the inner faces ofthe plates 5 and are larger than the apertures in the plates. y

The insulating bushings 9 are retained within the cov-er plate 5 bymetallic straps ll which are retained against the inner faces of theplates 5 by screws l2 applied from the exterior of thc cover plate 5.The straps ll are provided with suitable openings to receive the innerends of the insulators 9 and bear against the flanges 10 of the same, Inthis manner the various insulating bushings 9 are suitably supported inthe cover plates 5.

Every one of the bushings 9 is provided accordingly the elevation of theend frame with a terminal bolt 6 maintained in position in the bushingby means of a nut 21 threaded onto the outer end of the bolt and bearingagainst the washer 13 engaging the outer end of the bushing, orinsulator 9. Another nut 14 is threaded onto the bolt for clampingbetween it and the nut 21, a conductor, as is common practice.

The heads of the bolts 6 are received within enlargements 15 formed inthe insulators 9 and are connected to various leads from the primary andsecondary windings of the transformer.

For instance, the primary lead may be connected to the two terminals 6arranged in the offset portion 7 of the cover plate. Figure 2illustrates the leads 16 from a portion of the coil B connected to theterminals 6 arranged on the offset portion 7 of the cover plates 5.Other leads 17 and 18 on the coil B are connected to others of theterminals 6 as occasion demands.

The end frames and the cover plates are retained in assembled relation by means of bolts 19 passing through suitably disposed apertures in theend plates 5 and the end frames, and when the nuts 20 are also tightenedthe end plates are secured against the ends of the core A and the coverplates 5 fastened against the end plates.

A construction such as that herein exemplified enables the applicationof as many terminals to the transformer as may be desired for connectingthe transformer in circuit relation with a plurality of circuitsrequiring different voltages.

It will be observed that by making the horizontal flanges 3 of the endplate in the manner described so that these lie outwardly of the contourlines of the core A, additional space is provided between the ends ofthe coil B and the cover plate 5 so that as many internal connectionsmay be made in the chambers C.

The end plates are designated at D and E for convenience.

The invention has been described herein more or less precisely as todetails, yet it is to be understood that the invention is not to belimited thereby, as changes may be made in the arrangement andproportion of parts and equivalents substituted, without departing fromthe spirit and scope of the invention.

The invention is claimed as follows:

1. A transformer including a core and a coil, end frames of angularcross-section secured against the ends of the core, said frames havingcentral openings for the coil ends, said frames being secured to thecore with certain flanges thereof lying outwardly of the core andextending in directions away from the adjacent ends of the core toprovide terminal connection space between the coil ends and the frames,and cover plates secured against the margins of said flanges, said coverplates carrying terminal connections available for connection to outsidewires outwardly of said plates, leads to and from the primary andsecondary windings being connected to said terminal connections withinthe space between the cover plates and the adjacent ends of the coilwithin the outwardly extending flanges of the end frames.

f2. A transformer having flanged end plates, certain flanges of saidplates being disposed flatwise against the ends of the transformer coreand others of the flanges extending in directions away from the adjacentends of the core, and cover plates supported against the margins of saidlast mentioned flanges, said cover plates carrying terminal connections.

3. A transformer having flanged end plates, certain flanges of saidplates being disposed flatwise against the ends of the transformer coreand others of the flanges extending in directions away from the adjacentends of the core and outwardly of the boundaries of the core, coverplaies supported against the margins of the last named flanges, saidcover plates carrying terminal connections, and connections between saidterminals and the transformer leads connected within the last namedflanges of the cover plates and the adjacent ends of the core.

4. A transformer having flanged end plates, certain flanges of saidplates being disposed flatwise against the ends of the transformer coreand others of the flanges extending in directions away from the adjacentends of the core, and cover plates supported aga-inst the margins ofsaid last mentioned flanges, said cover plates carrying terminalconnections, the arrangement of the last named flanges providing spacebetween the core ends and the adjacent end plates for terminalconnections between the coil ends and said last named flanges.

In testimony whereof I have hereunto subscribed my name at Chicago, CookCounty,

Illinois.

ARNI HELGASON.

